A run-on sentence contains at least two independent clauses that have been joined without proper punctuation or conjunctions.
Run-on: I asked her to bring soft drinks she did not.
There are three separate cures:
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Separate the run-on sentence into two sentences with a period.
I asked her to bring soft drinks. She did not.
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Separate the clauses with a comma and coordinating conjunction.
I asked her to bring soft drinks, but she did not.
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Separate the clauses with a semicolon.
I asked her to bring soft drinks; she did not.
